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416
METALLURGY OF IRON AND STEEL.
tensile strength of 80,000 to 100,000 pounds per square inch, but as engineers have learned that the strongest bridge is not built of steel with .30 per cent, of carbon, so they must learn that it would be better to use a softer metal in castings.
TABLE XX-A.
Bars from Annealed Soft Castings and Uhannealed Bars Rolled from 6-Inch Ingots, together with Bars from Large Ingots.
Steel manufactured by The Pennsylvania Steel Company.
					H"			if
					fc		i->    d	2
							05     .3	a
c					     _d	sgl	^H 	<M
!	Composition; percent.				 o> O  ft a		fa?	o43*
3 d					'dfljjj	o'gS	ci  . o> a3	oS
43					6 ft ft	In $3	art o o	as
					-3 2 o* i ftte	3 ftS?	S8.S.S	o> A
w	C.	P.	Mn.	S.		H	H	tf
8552	.17	.027	.65	.034	68190	84290	24.00	82.1
8555	.17	.027	.66	.056	56030	82440	14.90	19.7
8557	.17	.032	.60	.029	65880	82750	27.13	42.3
8550	.17	.027	.65	.038	65350	80350	23.10	42.5
8563	.17	.024	.62	.024	59390	81790	20.10	84.5
8565	.23	.029	.65	.025	60060	88180	20,65	26.8
8568	.14	.029	.70	.082	58320	81750	17.25	20.8
8571	.18	.033	.58	.028	66700	80670	26.88	46.7
8578	.17	.023	.67	.027	67440	81430	21.66	86.7
8578	.17	.03(5	.70	.027	58860	84260	22.04	29.8
8577	.17	.037	.59	.020	67980	83220	23.00	89.3
8578	.17	.045	.67	.026	58810	83510	22.16	80.4
8570	.15	.037	.G3	.028	64940	82190	22.75	47.0
8580	.18	.033	.71	.017	'68970	84180	22.25	86.7
8582	.17	.036	.63	.024	56380	81520	18.00	25.5
8583	.18	.032	.61	.022	69400	85330	14.13	18.8
   8584	.18	.027	.60	.027	55970	29690	22.88	82.1
8586	.17	.027	.60	.027	55630	80800	18.50	31.4
8588	.16	.043	.63	.031	56950	82580	26.50	42.7
8592	.18	.027	.60	.028	59050	82940	20.00	83.0
Average of								
annealed	.17	.032	.64	.029	57515	82564	21.12	88.44
cast bars.								
2x%-inch bars  rolled  from  6-inch   square								
Ingots cast from the same heats and tested in					63523	42700	24.74	43.80
natural state								
Average of 2x%-inch bars rolled								
from 4-inch billets made from 16-				Natural	62089	42441	80.14	60.8
inch ingots of 7 different heats of				Annealed	65021	81576	80.86	60.00
about the same tensile strength								
as the above castings.								
Table XX-A gives the results of tests made on sample bars of cast steel, showing the composition and physical qualities. The silicon is not given, but it was below .05 per cent, in every case. The test piece was cut from a small coupon and this will explain why it was often necessary to pull the piece in a six-inch length. The